'export' in .env is causing issues when deploying contract to a test net

[jedecast]

export KOVAN_RPC_URL='www.infura.io/asdfadsfafdadf'
export PRIVATE_KEY='abcdef'
export ALCHEMY_MAINNET_RPC_URL="https://eth-mainnet.alchemyapi.io/v2/your-api-key"

causes:

failed to get chainId, falling back on net_version...
An unexpected error occurred:

ProviderError: Must be authenticated!

removing 'export' will fix the issue

KOVAN_RPC_URL='www.infura.io/asdfadsfafdadf'
PRIVATE_KEY='abcdef'
ALCHEMY_MAINNET_RPC_URL="https://eth-mainnet.alchemyapi.io/v2/your-api-key"

[ShawnFromTexas]

Have you tried using "import" instead?